4.7 Article

Transformation of CoFe2O4 spinel structure into active and robust CoFe alloy/N-doped carbon electrocatalyst for oxygen evolution reaction

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 625, Issue -, Pages 70-82

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.06.005

Keywords

CoFe; Dopamine; N-doped carbon; Electrocatalysts; Oxygen evolution reaction; CoFe2O4

Funding

  1. European Union's Horizon 2020 Research and Innovation programme under the Marie Sklodowska-Curie Actions-Innovative Training Networks (MSCA-ITN) [813748]
  2. MCIN/AEI [PID2020-115848RB-C21, PID2020-115848RB-C22]
  3. Marie Curie Actions (MSCA) [813748] Funding Source: Marie Curie Actions (MSCA)

Ask authors/readers for more resources

In this study, nitrogen-doped carbon-coated CoFe electrocatalysts were synthesized and the effect of carbonized polydopamine on the physicochemical properties and electrochemical activity of CoFe catalysts was investigated. It was found that the catalyst prepared with 30% dopamine exhibited excellent catalytic activity and durability for oxygen evolution reaction.
Electrochemical water splitting is an environmentally benign technology employed for H-2 production; however, it is critically hampered by the sluggish kinetics of the oxygen evolution reaction (OER) at the positive electrode. In this work, nitrogen-doped carbon-coated CoFe electrocatalysts were synthesized via a three-step route comprising (1) hydrothermal reaction, (2) in-situ polymerization of dopamine and (3) carbonization. The effect of carbonized polydopamine on the overall physicochemical properties and electrochemical activity of CoFe catalysts was systematically studied. By controlling and optimizing the ratio of CoFe2O4 and dopamine contents, a transformation of the CoFe2O4 structure to CoFe alloy was observed. It was found that CoFe/NC30% (prepared with 30% dopamine) exhibits an excellent catalytic activity towards OER. A small overpotential of 340 mV was required to generate a current density of 10 mA cm(-2) in a 1.0 M KOH electrolyte. More importantly, the CoFe/NC30% catalyst reflected exceptional durability for at least 24 h. This research sheds light on the development of affordable, highly efficient, and durable electrocatalysts for OER. (C) 2022 The Authors. Published by Elsevier Inc.

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